To make the marinade for the flank steak: add olive oil, beer, lime juice, Worcestershire sauce, garlic, chipotle and honey to shallow baking dish or large re-sealable plastic bag. Stir to combine.

Immerse flank steak in marinade. Cover dish with plastic wrap. Refrigerate and marinate for at least 8 hours or up 24 hours.

Preheat grill to high.

Remove steak from marinade and pat dry with paper towel. Season with salt and pepper.

Grill steak on high heat until rare to medium rare, about 6 to 8 minutes per side, depending on thickness. Overcooking flank steak will produce tough, chewy meat. Let steak rest before slicing, about 8 to 10 minutes. Cut steak across the grain into 1/8-inch thick slices.

Meanwhile, heat tortillas over medium heat in a dry hot pan or griddle until warmed and lightly toasted. Wrap tortillas in a clean kitchen cloth to keep warm. Alternatively, wrap tortillas in foil and heat for a few minutes in a 400 degrees F. oven.